This is a JS library that wraps several necessary methods to integrate DAB's registries/list and its two registries:

• The NFT List
• The Canister Registry.

It also includes a standard wrapper that unifies several NFT standards (EXT, ICPunks, etc...) under a common interface; and soon fungible tokens as well.

DAB is an open internet service for data registries. In V0.2.0 it provides two registries you can interact with using the DAB-js library.

1- The NFT registry, a list of NFTs that apps & developers can consume to auto-surface a user's owned NFTs from multiple collections, and support new NFT collections as they are listed in DAB, instead of manually adding them one by one.

2- The Canister Registry, a canister registry where you can associate Canister IDs to a metadata profile (name, front-end URL, description, logo...) to make them more discoverable by UIs. Using DAB-js, you will be able to query this metadata from a UI to show it, instead of just a plain Canister ID.

• DAB's website
• DAB's main repository
• DAB's documentation

DAB's NFT list is standard agnostic, meaning any NFT collection can be listed regardless of the NFT standard interface utilized (EXT, ICpunks, Departure Labs, etc...).

When integrating and consuming DAB's list, this would quickly become a problem for developers that need to use different methods, depending on the standard, to do a simple thing like transferring an NFT.

We solved this with the DAB-js library and its standard wrapper. DAB-js provides a common javascript interface with standard methods (transfer, getUserTokens, details, etc..) that the developer can use to make calls to any NFT in any collection. DAB's standard wrapper translates the call to match the appropiate methods of each standards.

Currently, DAB-js wraps the following standards. Developers are welcome to open PRs to suggest/help integrate new standards to DAB-js.

• EXT NFT Standard
• ICPunks NFT Standard
• Departure Labs

More standards will be wrapped as NFT collections following those standards are added to DAB's NFT list. Our next short term goal is supporting the Departure Labs NFT standard.

To pull and install from @Psychedelic via the NPM CLI, you'll need:

• A Github account
• A Github personal access token (you can create a personal acess token here)
• The personal access token with the correct scopes, repo and read:packages to be granted access to the GitHub Package Registry.
• Authentication via npm login, using your Github email for the username and the personal access token as your password:

Once you have those ready, run:

npm login --registry=https://npm.pkg.github.com --scope=@psychedelic

Note: You only need to configure this once to install the package! On npm login provide your Github email as your username and the Personal access token as the password.

You can also setup your npm global settings to fetch from the Github registry everytime it finds a @Psychdelic package, find the instructions here.

⚠️ Alternatively, a token could be passed to the .npmrc as //npm.pkg.github.com/:_authToken=xxxxxx but we'd like to keep it clean and tokenless.

First, you need to install the DAB-js npm package into your project.

You can do so from the command line:

npm install @psychedelic/dab-js@latest

Find more details about installing versions in the package page here

In this step, you will use the getAllUserNFTs method to get an array with all the NFTs (and their details) the user (a Principal ID) owns.

Here, DAB takes the identity you pass, and checks in every NFT collection currently on the DAB list (ICPunks, Starverse, etc...) for the individual assets the user owns (Punk#1230).

You need to pass:

• agent: An agent (an Http agent, instantiated with agent-js or Plug)
• user: A Principal object (a user's Principal ID instantiated as a principal object)

import { Principal } from '@dfinity/principal';
import { getAllUserNFTs } from '@psychedelic/dab-js'
...
const getNFTCollections = async () => {
  const principal = 'r4rmh-mbkzp-gv2na-yvly3-zcp3r-ocllf-pt3p3-zsri5-6gqvr-stvs2-4ae';
  const collections = await getAllUserNFTs({
    agent,
    user: Principal.fromText(principal)
  });
}
getNFTCollections();

This call will return an array that includes an NFTCollection interface with the details of each NFT Collection where a user owns an NFT (name, canister id, standard, tokens).

Inside that interface the tokens object includes an array with each individual NFT the user owns in the collection (e.g Punk#), and its details (index, canister, id, name, url, metadata, standard, collection). This is all the data you need to surface in the UI for your user.

const getAllUserNFTs = async ({
  agent: HttpAgent,
  user: Principal
}): Promise<Array<{
  name: string;
  canisterId: string;
  standard: string;
  icon: string;
  description: string;
  tokens: Array<{
    index: bigint;
    canister: string;
    id?: string;
    name?: string;
    url: string;
    metadata: any;
    standard: string;
    collection?: string;
  }>;
}>>

Here's a more detailed breakdown of each interface the array returns for clarity:

interface NFTDetails {
  index: bigint;
  canister: string;
  id?: string;
  name?: string;
  url: string;
  metadata: any;
  standard: string;
  collection?: string;
}

interface NFTCollection {
  name: string;
  canisterId: string;
  standard: string;
  tokens: NFTDetails[];
  icon: string;
  description: string;
}

const getAllUserNFTs = async ({
  agent: HttpAgent,
  user: Principal
}): Promise<NFTCollection[]>

To interact with the user's NFTs and, for example, trigger a transfer, you need to initialize/get an NFT actor object. This is done using the getNFTActor method, where you need to pass:

• canisterID: the Canister ID of the collection you want to interact with (e.g ICPunks)
• agent: and HttpAgent (instantiated with agent-js or Plug)
• standard: a str with the name of the NFT collection's standard (EXT, ICPunks)

(Current standards supported and string name: EXT, ICPunks)

import { getAllUserNFTs } from '@psychedelic/dab-js'

export const getNFTActor = ({
  canisterId: string,
  agent: HttpAgent,
  standard: string
}): NFT => {
  return new NFT_STANDARDS[standard](canisterId, agent);
};

This should return an actor object with the following interfaces.

export default abstract class NFT {
  abstract standard: string;

  agent: HttpAgent;

  canisterId: string;

  constructor(canisterId: string, agent: HttpAgent) {
    this.agent = agent;
    this.canisterId = canisterId;
  }

  abstract getUserTokens(principal: Principal): Promise<NFTDetails[]>;

  abstract transfer(to: Principal, tokenIndex: number): Promise<void>;

  abstract details(tokenIndex: number): Promise<NFTDetails>;
}

As you can see this actor contains the standard javascript interface of DAB's NFT standard wrapper. It has generic calls to interact with NFTs regardless of their standard (as long as their interface is wrapped in the standard wrapper).

• getUserTokens: Fetches an array of all NFTs the passed identity owns in the collection.
• transfer: Request the transfer of an NFT the user owns to another address.
• details: Returns the details of any token in the collection.

This method allows you to fetch an array with the details of all the tokens a user owns in the collection you have initialized in the actor.

Here, you would need to pass:

• principal: a str of the user's Principal ID you want to check for owned NFTs.

(See that in the variable NFTActor, we are instantiating the NFT actor object, passing a canisterID for the collection we want to interact with, an agent, and the name of the standard as a str).

import { Principal } from '@dfinity/principal';
import { getNFTActor } from '@psychedelic/dab-js'

...
const getUserNFTs = async () => {
  const principal = 'r4rmh-mbkzp-gv2na-yvly3-zcp3r-ocllf-pt3p3-zsri5-6gqvr-stvs2-4ae';
  const canisterId = 'qcg3w-tyaaa-aaaah-qakea-cai';
  const standard = 'ICPunks';
  const NFTActor = getNFTActor({ canisterId, agent, standard });
  const userTokens = await NFTActor.getUserTokens(Principal.fromText(principal));
}
getUserNFTs();

This returns an array with the following interface, with metadata of each owned NFT:

export interface NFTDetails {
  index: bigint;
  canister: string;
  id?: string;
  name?: string;
  url: string;
  metadata: any;
  standard: string;
  collection?: string;
}

This method allows you to request the transfer of an NFT the passed identity owns in the collection you have initialized in the actor.

In this method you need to pass:

• to: a str of a Principal ID for the destination address.
• index: the index number of the NFT to be transferred.

(See that in the variable NFTActor, we are instantiating the NFT actor object, passing a canisterID for the collection we want to interact with, an agent, and the name of the standard as a str).

import { Principal } from '@dfinity/principal';
import { getNFTActor } from '@psychedelic/dab-js'

...
const sendNFT = async () => {
  const to = 'r4rmh-mbkzp-gv2na-yvly3-zcp3r-ocllf-pt3p3-zsri5-6gqvr-stvs2-4ae';
  const index = 5;
  const standard = 'ICPunks'
  const canisterId = 'qcg3w-tyaaa-aaaah-qakea-cai';
  const NFTActor = getNFTActor({ canisterId, agent, standard });
  await NFTActor.transfer(Principal.fromText(to), index);
}
sendNFT();

The transfer call, if successful doesn't return anything after being executed. If the transaction fails, it will return an error.

This method allows you to fetch an array with the details and metadata of any asset on the index of the NFT collection you initialized in the actor.

In this method, you need to pass:

• tokenIndex: the index number for the token in the collection you want the details of.

(See that in the variable NFTActor, we are instantiating the NFT actor object, passing a canisterID for the collection we want to interact with, an agent, and the name of the standard as a str).

import { Principal } from '@dfinity/principal';
import { getNFTActor } from '@psychedelic/dab-js'

...
const getTokenDetails = async () => {
  const tokenIndex = 5;
  const canisterId = 'qcg3w-tyaaa-aaaah-qakea-cai';
  const standard = 'ICPunks';
  const NFTActor = getNFTActor({ canisterId, agent, standard });

  const details = await NFTActor.details(tokenIndex);
}
getTokenDetails()

This call returns one object with the metadata of the specific NFT queried.

These are the methods utilized to interact with the Canister List to check if a Canister ID has associated metadata in DAB, returning a metadata object you can display in your app for a better UI/UX.

This method allows you to query the DAB canister registry to fetch the metadata for a specific Canister ID. You will need to pass:

• canisterID: the Canister ID of the canister you want to check in DAB.
• agent: and HttpAgent (instantiated with agent-js or Plug)

import { getCanisterInfo } from '@psychedelic/dab-js';
const agent = new HttpAgent();
const nnsCanisterId = 'ryjl3-tyaaa-aaaaa-aaaba-cai';
const nnsMetadata = await getCanisterInfo({ canisterId: nnsCanisterId, agent });
console.log(nnsMetadata);

If the Canister ID has metadata associated in the Canister Registry, it will return a metadata object. Else, it will return undefined.

type CanisterId = Principal | string;
interface CanisterMetadata {
  url: string;
  name: string;
  description: string;
  version: number;
  logo_url: string;
}

This second method is a variation that allows you to query DAB to check the metadata of multiple canisters at once. The main differences is that you will pass:

• canisterIDs: An array of several canister IDs of the canisters you want to check in DAB.
• agent: and HttpAgent (instantiated with agent-js or Plug) .

import { getMultipleCanisterInfo } from '@psychedelic/dab-js';

const agent = HttpAgent();
const canisterIds = ['e3izy-jiaaa-aaaah-qacbq-cai', 'qcg3w-tyaaa-aaaah-qakea-cai']; // Cronic + ICPunks
const nftsInfo = await getMultipleCanisterInfoFromDab({ canisterIds, agent });
console.log(nftsInfo);

In contrast to the previous method, this will return an array of metadata objects for all the canister IDs you entered.